Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 02, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative-effect adjustment, increase in retained earnings			$ 6,322	$ (4,179)
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Lease liability		$ 122,900
Lease, right-of-use asset		$ 118,700
Cumulative-effect adjustment, increase in retained earnings	$ 6,300